Love can be expressed between two people by touching, kissing, and having sexual pleasure. The idea that sexual desire is made by Satan was created by the Ocidental religions and strongly reinforced by the Catholic church during the medieval age.
Most of the oriental religions (budhism, taoism, xintoism, hinduism,...) consider sexual pleasure as a gift from God (or whoever they call God), and a way through spiritual enlightening.
Reproduction can only be achieved between two individuals of the oposite sex. Sexual pleasure don't have this limitation.
Putting aside the genetic discussion, we can still consider that homosexuality is just one part of a more complex social behavior envolving sexual relations between indiviuals of a community. Actually, this behavior is very common in the wild nature. Social animals (chipanzes, lions, deers, antilopes, elephants, just to point a few) have homosexual relationships, sometimes more solid than heterosexual ones.
That was my two cents to the discussion...
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